fixcoff.c revision 1.3 
1/*	$NetBSD: fixcoff.c,v 1.3 2001/02/19 22:48:58 cgd Exp $ */
2
3/*
4 * Copyright (c) 1999 National Aeronautics & Space Administration
5 * All rights reserved.
6 *
7 * This software was written by William Studenmund of the
8 * Numerical Aerospace Similation Facility, NASA Ames Research Center.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the National Aeronautics & Space Administration
19 *    nor the names of its contributors may be used to endorse or promote
20 *    products derived from this software without specific prior written
21 *    permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE NATIONAL AERONAUTICS & SPACE ADMINISTRATION
24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
26 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE ADMINISTRATION OR CONTRIB-
27 * UTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
28 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
34 */
35
36/*
37 * This program fixes up the extended xcoff headers generated when an elf
38 * file is turned into an xcoff one with the current objcopy. It should
39 * go away someday, when objcopy will correctly fix up the output xcoff
40 *
41 * Partially inspired by hack-coff, written by Paul Mackerras.
42 */
43
44#include <stdio.h>
45#include <stdlib.h>
46#include <unistd.h>
47#include <fcntl.h>
48
49#include "../../../../../gnu/dist/include/coff/rs6000.h"
50
51void
52usage(prog)
53	char	*prog;
54{
55	fprintf(stderr, "Usage: %s [-h] | [<file to fix>]\n", prog);
56}
57
58void
59help(prog)
60	char	*prog;
61{
62	fprintf(stderr, "%s\tis designed to fix the xcoff headers in a\n", prog);
63	fprintf(stderr,
64"\tbinary generated using objcopy from a non-xcoff source.\n");
65	usage(prog);
66	exit(0);
67}
68
69main(argc, argv)
70	int		argc;
71	char * const	*argv;
72{
73	int	fd, i, n, ch;
74	struct	external_filehdr	efh;
75	AOUTHDR				aoh;
76	struct	external_scnhdr		shead;
77
78	while ((ch = getopt(argc, argv, "h")) != -1)
79	    switch (ch) {
80		case 'h':
81		help(getprogname());
82	}
83
84	argc -= optind;
85	argv += optind;
86
87	if (argc != 1) {
88		usage(getprogname());
89		exit(1);
90	}
91
92	if ((fd = open(argv[0], O_RDWR, 0)) == -1)
93		err(i, "%s", argv[0]);
94
95	/*
96	 * Make sure it looks like an xcoff file..
97	 */
98	if (read(fd, &efh, sizeof(efh)) != sizeof(efh))
99		err(1, "%s reading header", argv[0]);
100
101	i = ntohs(*(u_int16_t *)efh.f_magic);
102	if ((i != U802WRMAGIC) && (i != U802ROMAGIC) && (i != U802TOCMAGIC))
103		errx(1, "%s: not a valid xcoff file", argv[0]);
104
105	/* Does the AOUT "Optional header" make sence? */
106	i = ntohs(*(u_int16_t *)efh.f_opthdr);
107
108	if (i == SMALL_AOUTSZ)
109		errx(1, "%s: file has small \"optional\" header, inappropriate for use with %s", argv[0], getprogname());
110	else if (i != AOUTSZ)
111		errx(1, "%s: invalid \"optional\" header", argv[0]);
112
113	if (read(fd, &aoh, i) != i)
114		err(1, "%s reading \"optional\" header", argv[0]);
115
116	/* Now start filing in the AOUT header */
117	*(u_int16_t *)aoh.magic = htons(RS6K_AOUTHDR_ZMAGIC);
118	n = ntohs(*(u_int16_t *)efh.f_nscns);
119
120	for (i = 0; i < n; i++) {
121		if (read(fd, &shead, sizeof(shead)) != sizeof(shead))
122			err(1, "%s reading section headers", argv[0]);
123		if (strcmp(shead.s_name, ".text") == 0) {
124			*(u_int16_t *)(aoh.o_snentry) = htons(i+1);
125			*(u_int16_t *)(aoh.o_sntext) = htons(i+1);
126		} else if (strcmp(shead.s_name, ".data") == 0) {
127			*(u_int16_t *)(aoh.o_sndata) = htons(i+1);
128		} else if (strcmp(shead.s_name, ".bss") == 0) {
129			*(u_int16_t *)(aoh.o_snbss) = htons(i+1);
130		}
131	}
132
133	/* now write it out */
134	if (pwrite(fd, &aoh, sizeof(aoh), sizeof(struct external_filehdr))
135			!= sizeof(aoh))
136		err(1, "%s writing modified header", argv[0]);
137	close(fd);
138	exit(0);
139}
140